Synthetic Or Natural Fiber

Tumbled hematite

Hematite (Fe₂O₃), commonly sold as “magnetic hematite” when synthetic or magnetized

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite crescent pendant

Opalite (man-made opalescent glass; not a natural mineral)

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Iridescent coated quartz (likely synthetic/display gemstone)

Quartz, silicon dioxide (SiO₂), likely faceted and surface-coated; exact material cannot be confirmed visually

Cubic Zirconia (CZ)

Zirconium dioxide (ZrO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Opalite Glass

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Diamond (Faceted Gemstone)

Native Carbon (C)

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)

Opalite

Synthetic Opalite Glass (Silicon Dioxide)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Opalite

Synthetic glass (SiO2 + metal additions)

Opalite

Man-made Glass (SiO2 + additives)

Blue-green turquoise (probable)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Yellow faceted gemstone earrings, likely citrine or yellow beryl

Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Diamond (Baguette cut)

Carbon (C)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with Fe3+ impurities

K2 Stone (or K2 Jasper)

Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Opalite

Synthetic glass / Opaque silicious glass

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Opalite

Synthetic Opalised Glass

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Cubic Zirconia (Diamond Simulant)

Zirconium Dioxide (ZrO2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Diamond (Cut Gemstone)

Carbon (C)

Composite Turquoise or Reconstituted Turquoise with Copper inclusions

CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes

Polished tiger iron

Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)

Red synthetic corundum (ruby-colored lab-grown sapphire)

Corundum, aluminum oxide (Al₂O₃), likely synthetic and chromium-colored

Likely blue sapphire ring

Corundum (Al₂O₃), likely sapphire; surrounding stones may be diamonds or colored gems

Opalite

Synthetic Glass (Simulated Opal)

Black spinel bead bracelet

Spinel (magnesium aluminate), MgAl₂O₄